Table 1.
Urinary iodine concentration by sociodemographic and lifestyle characteristics, NHANES 2007–2012 1.
| General Characteristics | Total | Men | Women | |||
|---|---|---|---|---|---|---|
| n (Wt’d % 2) | Median UIC (95% CI) | n (Wt’d %) | Median UIC (95% CI) | n (Wt’d %) | Median UIC (95% CI) | |
| Total | 5967 (100.0) | 141.4 (133.5–149.2) 3 | 3133 (52.3) | 158.0 (149.0–167.1) | 2834 (47.7) | 126.1 (119.5–132.7) |
| Survey period | ||||||
| 2007–2008 | 3444 (56.9) | 151.4 (139.5–163.4) | 1811 (57.5) | 166.9 (156.7–177.2) | 1633 (56.2) | 134.4 (124.1–144.8) |
| 2009–2010 | 1356 (21.0) | 132.0 (121.1–142.9) | 706 (21.3) | 139.0 (124.6–153.4) | 650 (20.7) | 126.2 (117.4–135.1) |
| 2011–2012 | 1167 (22.1) | 126.6 (111.3–141.9) | 616 (21.1) | 150.6 (129.0–172.1) | 551 (23.1) | 104.8 (92.2–117.5) |
| Age, years | ||||||
| 20–39 | 2311 (44.1) | 141.5 (132.9–150.1) | 1199 (44.5) | 149.4 (139.3–159.5) | 1112 (43.7) | 134.0 (120.4–147.6) |
| 40–59 | 1997 (38.0) | 133.6 (123.8–143.5) | 1028 (38.6) | 161.0 (143.7–178.3) | 969 (37.3) | 117.1 (108.2–126.1) |
| 60 and above | 1659 (17.9) | 159.9 (145.1–174.6) | 906 (16.9) | 177.4 (164.5–190.4) | 753 (19.0) | 136.7 (116.5–157.0) |
| Race/ethnicity 4 | ||||||
| NHW | 2373 (63.8) | 141.5 (130.9–152.2) | 1285 (64.3) | 166.9 (155.5–178.3) | 1088 (63.3) | 122.5 (112.5–132.5) |
| NHB | 1388 (13.2) | 127.4 (116.3–138.5) | 714 (12.0) | 128.8 (116.6–141.1) | 674 (14.5) | 124.9 (111.8–138.0) |
| All Hispanics | 1798 (16.3) | 154.2 (144.9–163.5) | 898 (16.8) | 164.7 (152.9–176.5) | 900 (15.7) | 146.0 (135.3–156.7) |
| Other | 408 (6.7) | 136.6 (117.2–155.9) | 236 (6.9) | 142.0 (124.1–159.8) | 172 (3.1) | 119.6 (94.1–145.1) |
| Iodine-containing supplement use 5 | ||||||
| Yes | 442 (7.8) | 182.4 (155.9–209.0) | 243 (8.2) | 200.5 (155.6–245.4) | 199 (7.4) | 168.7 (137.1–200.3) |
| No | 5525 (92.2) | 137.6 (129.6–145.7) | 2890 (91.8) | 153.9 (143.8–164.0) | 2635 (92.6) | 122.8 (114.6–131.0) |
| Table salt use 6 | ||||||
| Rarely | 1760 (41.9) | 138.2 (127.9–148.4) | 900 (41.3) | 152.2 (135.4–168.9) | 860 (42.6) | 124.6 (114.7–134.6) |
| Occasionally/very often | 2257 (58.1) | 144.1 (131.9–156.3) | 1251 (58.7) | 156.2 (144.0–168.5) | 1006 (57.4) | 128.6 (114.5–142.7) |
| Salt use in preparation 6 | ||||||
| Never/rarely | 3012 (75.5) | 140.3 (131.0–149.5) | 1595 (75.0) | 153.0 (140.2–165.7) | 1417 (76.1) | 125.6 (116.8–134.3) |
| Occasionally/very often | 1005 (24.5) | 146.6 (128.4–164.7) | 556 (25.0) | 160.5 (142.0–179.0) | 449 (23.9) | 132.1 (111.9–152.3) |
| Prevalence of <50 µg/L UIC | ||||||
| <50 µg/L | 665 (11.9) | 33.8 (32.1–35.6) | 287 (8.5) | 33.5 (30.7–36.4) | 378 (15.6) | 33.8 (31.9–35.7) |
| ≥50 µg/L | 5302 (88.1) | 161.9 (153.5–170.2) | 2846 (91.5) | 171.6 (163.7–179.5) | 2456 (84.4) | 149.7 (141.3–158.1) |
1 Data are from the National Health and Nutrition Examination Surveys. All data except for sample size are weighted accounting for the complex study design according to the directions of the National Center for Health Statistics. UIC, urinary iodine concentration; 2 Wt’d %: Weighted %; 3 Median UICs (95% CIs, confidence intervals); 4 NHW, non-Hispanic white; NHB, non-Hispanic black; 5 Reported taking iodine-containing supplement yesterday; 6 The total n for salt use variables was 4017.